One thing to be aware of is two 18650's side by side will need a 36mm tube but a D cell is only 32mm diameter and shorter so not that easy to fit. Honestly the best advice is bin it and get a new torch.
One thing to be aware of is two 18650's side by side will need a 36mm tube but a D cell is only 32mm diameter and shorter so not that easy to fit. Honestly the best advice is bin it and get a new torch.
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